The original Honda CB750 motorcycle had a 736 cc engine.
Honda introduced the CB750 in 1969, and its air-cooled, transverse, inline-four engine became one of the model’s defining features. The engine was commonly marketed as a 750, but its exact displacement was 736 cc.
The CB750 combined four-cylinder performance with features including an electric starter and a front disc brake. This specification helped make it an influential early superbike and brought high-performance motorcycle technology to a wider market.
A common mix-up is treating the model name as the precise engine size. “CB750” refers to the approximate class and marketing designation, while the factory engine displacement was 736 cc. Later Honda models and other 750-class motorcycles used different exact capacities.